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The Speed control by variation of field flux results in _____________

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The Speed control by variation of field flux results in _____________

(a) Constant torque drive

(b) zero speed

(c) Variable torque drive

(d) Variable power drive

The question was posed to me by my college professor while I was bunking the class.

This intriguing question originated from Motors Rating and Heating topic in section Rating and Heating of Motors of Electric Drives

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Correct option is (c) Variable torque drive

To elaborate: Field flux control method is used to achieve the speed above the base speed. It provides constant power drive and variable torque drive.

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